A Temperature-Insensitive High-Precision Wide-Range Relaxation Oscillator

A relaxation oscillator, high-precision technology, applied in the direction of automatic power control, pulse technology, pulse generation, etc., to achieve good consistency, achieve coarse and fine adjustment, and wide output frequency range

Active Publication Date: 2021-08-31
长沙锐逸微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polysilicon resistance varies by ±10% with temperature, voltage, and process angle, and MOS capacitance varies by more than ±10% with voltage, temperature, and process angle, and delay changes introduced by inverters, buffers, etc. eventually lead to output Clock CLK frequency may have ±20% deviation

Method used

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  • A Temperature-Insensitive High-Precision Wide-Range Relaxation Oscillator
  • A Temperature-Insensitive High-Precision Wide-Range Relaxation Oscillator
  • A Temperature-Insensitive High-Precision Wide-Range Relaxation Oscillator

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] see image 3 As shown, a temperature-insensitive high-precision wide-range oscillator of the present invention mainly includes a bias voltage (101), a reference current (102), a programmable current mirror (103), and a relaxation oscillator unit (104) and shaping logic (105) modules.

[0036] combine image 3 As shown, the oscillator mainly includes a power-on initialization stage, a frequency band selection stage, a frequency coarse adjustment and fine adjustment stage, and a temperature compensation stage. The specific implementation methods are as follows:

[0037] 1. Power-on initialization phase

[0038] In the power-on initialization stage, the relaxation oscillator mainly provides the correct bias voltage for the reference current (102) and the programmable current mirror (103) based on the bias voltage (101), the con...

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Abstract

The invention discloses a high-precision wide-range relaxation oscillator which is insensitive to temperature, including a bias voltage (101), a reference current (102), a programmable current mirror (103), a relaxation oscillator unit (104) and a shaping Logic (105) module; provide programmable charge and discharge current for the relaxation oscillator unit through bias voltage (101), reference current (102) and programmable current mirror (103), so as to realize wide-range frequency characteristics of multi-band output; through The frequency adjustment and temperature compensation technology in the reference current (102) realizes the coarse adjustment and fine adjustment of the output frequency of each frequency band, and produces a high-precision output clock; at the same time, it uses the positive temperature coefficient characteristics of the resistance and the negative temperature coefficient characteristics of the triode to achieve full temperature Within the range, the output frequency of the oscillator is insensitive to temperature and has good temperature drift characteristics; the shaping logic (105) compares the output waveform of the relaxation oscillator unit, multiplies the frequency, and feedbacks the charging and discharging of the capacitor, and finally outputs a clock signal of the target frequency. The relaxation oscillator proposed in this patent has the characteristics of wide output frequency range, high precision and insensitivity to temperature.

Description

technical field [0001] The present invention mainly relates to the field of high-performance clock design, in particular to a high-precision wide-range relaxation oscillator structure that is not sensitive to temperature. The negative temperature characteristic of the triode is compensated for the temperature drift coefficient, which makes it possible to generate a high-precision wide-range clock that is not sensitive to temperature. Background technique [0002] Oscillators are an important part of many electronic systems, from clock generation in microprocessors to carrier synthesis in cellular phones, oscillators are ubiquitous, and in different applications, the requirements for the structure and performance parameters of oscillators vary widely. big difference. Oscillators are generally classified into relaxation oscillators (also known as RC oscillators), inductor capacitor oscillators, crystal oscillators, tuning fork oscillators, etc. The relaxation oscillator is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K3/011H03K3/017H03K3/012H03L7/099
CPCH03K3/011H03K3/012H03K3/017H03L7/099
Inventor 不公告发明人
Owner 长沙锐逸微电子有限公司
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